Detailed Weather Data for Project: WEBB

Date Time TAIR WSPD RELH SRAD 05Mar2018 8 a.m. 52.72 2.50 98.24 24.10 05Mar2018 9 a.m. 59.25 16.20 71.77 186.00 05Mar2018 10 a.m. 53.04 25.60 56.45 505.50 05Mar2018 11 a.m. 56.19 20.70 38.95 674.60 05Mar2018 12 p.m. 57.29 18.80 34.92 793.10 05Mar2018 1 p.m. 57.36 19.60 33.33 841.50 05Mar2018 2 p.m. 57.81 17.40 28.72 829.30 05Mar2018 3 p.m. 58.24 18.10 23.29 731.90 05Mar2018 4 p.m. 59.04 15.70 18.90 497.50 05Mar2018 5 p.m. 59.00 13.50 18.13 329.20 05Mar2018 6 p.m. 58.06 11.80 19.11 87.20 05Mar2018 7 p.m. 47.79 13.60 34.83 0.00 05Mar2018 8 p.m. 53.58 8.20 26.38 0.00 05Mar2018 9 p.m. 48.60 1.20 34.94 0.00 05Mar2018 10 p.m. 44.82 1.60 45.08 0.00 05Mar2018 11 p.m. 44.28 2.00 61.90 0.00 06Mar2018 12 a.m. 38.98 1.10 68.02 0.00 06Mar2018 1 a.m. 35.92 0.40 66.53 0.00 06Mar2018 2 a.m. 33.89 0.60 69.90 0.00 06Mar2018 3 a.m. 31.91 0.80 73.26 0.00 06Mar2018 4 a.m. 32.47 2.30 76.66 0.00 06Mar2018 5 a.m. 36.28 1.60 78.27 0.00 06Mar2018 6 a.m. 37.69 2.50 59.24 0.00 06Mar2018 7 a.m. 37.24 2.20 63.87 0.00 Accuml. Values 1151.45 218.00 1200.69 5499.90 Num. Valid Values 24 24 24 24 Avg. Values 47.98 9.08 50.03 229.16 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 8.88 350.76 50.03 472.88 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4997 definition: xcompl = 1 - (RELH_avg/100) TdC = -1.0000 definition: TdC = TAIR_avg - ((14.55 + (0.114*TAIR_avg))*xcompl +pow((2.5 + 0.007*TAIR_avg)*xcompl, 3) + (15.9 +0.117*TAIR_avg)*pow(xcompl, 14)) del_lambda1 = 0.5388 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.4612 definition: del_lambda2 = 1 - del_lambda1 Qn = 4.3909 definition: Qn = 0.00714*SRAD_avg + 0.00000526*SRAD_avg*pow(TAIR_avg+17.8, 1.87) +0.00000394*pow(SRAD_avg, 2) - 0.00000000239*pow(SRAD_avg, 2)*pow(TAIR_avg-7.2, 2) - 1.02 es_ea = 5.7223 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 6.6709 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.214 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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